67987-83-1 Dispiro(furan-3(2H),1'(5'H)-naphthalene-5',2''-oxiran)-2-one,4'-(acetyloxy)-4'a-((acetyloxy)methyl)-5-(3-furanyl)decahydro-2'-methyl-, (1'R,2'R,2''R,4'S,4'aR,5R,8'aS)-